Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f1673a26c0a802…

MALICIOUS

PDF

34.4 KB Created: 2020-04-14 16:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2edcc4cc05ced531b1e7cc9cbea97f07 SHA-1: 8eb6adeab438a0e8a1a176046dc7980ddfae236a SHA-256: 74f1673a26c0a802120fb0e00eaf9b3838b61eef40661f19d98e46e5ecf42c94
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is not benign. No scripts were extracted, but the PDF structure itself suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://valentinarise.com/uploads/1/3/1/6/131637014/131637014.html#badmash+dil+song++mr+jatt PDF link annotation
    • http://truerink.com/uploads/1/3/0/6/130622104/buwasa_vogoxaxofugoda_xasuvuwuzigo_gofen.pdfIn PDF document text
    • http://lanelab.ca/uploads/1/3/1/1/131164152/3254991.pdfIn PDF document text
    • http://nguyentherapykamloops.com/uploads/1/3/1/4/131438111/risow.pdfIn PDF document text
    • http://kelseyalannaphotography.com/uploads/1/3/0/7/130775111/6123556.pdfIn PDF document text
    • http://ambidfilms.com/uploads/1/3/1/1/131164430/4281863.pdfIn PDF document text
    • http://lorettasdecorating.com/uploads/1/3/1/1/131163514/bigagobom_tozosetoda_vasepafudev.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cdd.bin
052d5318d480fb4fc86b105a1529021bc43e2ebee3e6908db5979ba4558d2bd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDD 8668 bytes

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